Solid

In solids, particles are tightly or closely packed.The gaps between the particles are tiny and hence it is tough to compress them.Solid has a fixed shape and volume.Due to its rigid nature, particles in solid can only vibrate about their mean position and cannot move.Force of attraction between particles is adamant.The rate of diffusion in solids is very low.An example of solids: solid ice, sugar, rock, wood, etc.

Liquid

In a liquid, particles are less tightly packed as compared to solids.Liquids take the shape of the container in which they are kept.Liquids are difficult to compress as particles have less space between them to move.Liquids have fixed volume but no fixed shape.The rate of diffusion in liquids is higher than that of solids.Force of attraction between the particles is weak than solids.Example of liquids: water, milk, blood, coffee, etc.

Gas

In gases, particles are far apart from each other.Force of attraction between the particles is negligible and they can move freely.Gases have neither a fixed volume nor a fixed shape.The gaseous state has the highest compressibility as compared to solids and rate is diffusion is higher than solids and liquids.The kinetic energy of particles is higher than solids and liquids.An example of gases: air,helium, nitrogen, oxygen, carbon dioxide, etc.